756 GRAM INE POA 
conduplicate, 34-3 inches long, less than 1 line wide: panicle 1-114 inches 
long, oblong, loosely-flowered, with a pale silvery hue:_ spikelets oblong- 
linear, 3-4 lines long, 3-5-flowered: empty glumes subequal, 2-214 lines long, 
3-, 4- or 5-nerved, obovate, with shining scarious margins: flowering glumes 
nearly 3 lines long, oval or ovate, denticulate, 5-7-nerved: palets lanceo- 
late, about as long as the glumes. On the top of Ashland Butte in the 
Siskiyou Mountains, Oregon. ; 
P. macrantha Vasey Bull. Torr. Bot. Club. xv, 11. Stems stout’ 
- smooth, 15-20 inches high, from stout perennial creeping rootstocks, dice- 
cious: sheaths loose, equalling or exceeding the internodes: ligules 4-1 
line long: leaves folded orinvolute, the lower ones with sterile branches in 
their axils, 6-10 inches Jong, blunt or abruptly acute at the apex: panicle 
2-5 inches long, sometimes interrupted below,its branches in twos or threes, 
erect, the longest 11-244 inches long: staminate spikelets 5-8 lines long, 
compressed, 4-7-flowered, yellowish: empty glumes oblong-lanceolate. the 
first, 4-5 lineslong, 3-5-nerved, ciliate on the midnerve; second 4-6 lines 
long, 3-7-nerved: flowering glumes 4-5 lines long, oval or lanceolate, with 
soft hairs at base and minutely pubescent on the nerves, the apex notched, 
awnless, 3-10-nerved: palet. but very little shorter than its glume, linear, 
ciliate on the keels; pistillate spikelets rather smaller and more compact. 
On sand-dunes along the coast of Oregon and Washington. 
§ 2 Evpoa Glumes usually acute, more or less prominently 
carinate, with or without cobwebby hairs at the base of the flow- 
ering glumes. | 
P. annua L. Sp. 68. A soft depressed or sometimes erect annual: 
stems weak, 2-12 inches long: sheaths shorter than the internodes: ligules 
1-2 lines long: basal leaves 4-24 as long as the stem; those of the stems 3, 
flat or conduplicate, abruptly acute, the upper 14-2 inches long: panicle 
ovoid or pyramidal, subsecund, 1-3 inches long, its branches mostly in pairs, 
the longest 1-2 inches long, sometimes drooping: spikelets 2-3 lines long, 
3-7-flowered,; oval or ovate-lanceolate: empty glumes compressed ; the first 
1-5-nerved, the second 3-nerved, broadest at or above the middle, usually 
1-2 lines long: flowering glumes ovate-oval, smooth, erose at the apex, 1-2 
lines long, with soft hairs on the keel for half its length and on the lower 
part of the lateral nerves: palet about 24 lines long, ciliate or pubescent 
on the keels. Common everywhere: naturalized from Europe. — 
P. subaristata Scribn. Macoun Cat. Can. Pl. 4, 227, name only. A 
slender densely tufted perennial 10-20 inches high: leaves of sterile shoots 
conduplicate, scabrous, 244-5 inches long: sheaths of the stem 2, smooth, 
the upper one nearly half as long as the stem: ligules % line long: upper 
leaf pungent, 46-2 inches long: panicle linear to oval, dense, somewhat in- 
terrupted, 114-3 inches long: spikelets linear-lanceolate, 4-7-flowered, 3-5 
lines long ; empty glumes subequal, linear-lanceolate, 3 lines long, 1-nerved; 
flowering glumes linear-lanceolate, 3 lines long, scabrous on the nerves, not 
webbed: palet 24 lines long, ciliolate on the keels. Idaho to Wyoming. 
P. Cusickii Vasey Cont. U. 8. Nat. Herb. i, 271. A glabrous, tufted 
perennial 16-20 inches high: leaves ofthe stem 2: lower sheaths longer 
than the internodes: ligules 1-1 lines long: leaves flat or involute, acute, 
2-246 inches long, less than 1 line wide: panicle more or less exserted, 
narrow, 3-5 inches long, the branches mostly in pairs, the longest 144-2 
inches long, bearing 4-8 spikelets on the outer half: spikelets 3-34¢ lines 
long, 2-3-flowered: rachella hispidulous: empty glumes with broad char- 
flaceo-hyaline margins, first ovate-lanceolate, nearly 2 lines long, l-nerved, 
rarély 3-nerved, second oval erosely acute, about 2 lines long, 3-nerved: 
towering glumes keeled 22-14 lines long, scabrous, oval, subacute: palets 
5 lines long, 2 toothed, ciliate on the keels. In the mountains of eastern 
